M.6.
Have you looked at Bare Necessities? Here is a sports bra (I am a tough size myself at 30 or 32 D/DD) that I looked at. I ended up getting something else, but I see they are on sale and I still might get one (ya know, for all the working out I am going to do after the New Year!).
https://www.barenecessities.com/freya-sonic-sports-bra-aa...
If you are uncomfortable checking out the link, you can just go to their website and search by size and it will come up.
I have also done two bras - I hate it, but sometimes a necessary evil. There is a Victoria's Secret one that I use for the outer bra so I can use a 32DD that isn't too bad - it is a front clasp plus a zip front.
Good luck!